升级IOS文件：

　　archive download-sw/overwrite（覆盖原IOS）/reload（重启） ftp://x.tar

　　或者

　　archive download-sw/leave-old-sw（保留原IOS）/reload（重启） ftp://x.tar

　　download时会有算法来验证新IOS是否适合当前模块和内存，否则会报错。

　　如查选用/overwrite，不管down的IOS是否与现在相同，都会被删除。

　　download完成后，会自动将boot参数指向新IOS.

　　（文档虽然没讲，但是我想，有足够flash空间的情况下，还是不要覆盖原IOS，传完再删）

　　上传IOS文件：

　　archive upload-sw ftp://x.tar

　　上传算法会自动把多个系统文件生成为。tar ，并上传。

　　（详细系统组成文件见文档937页）：info， the Cisco IOS image， and the web management files.

　　IOS恢复参见文档里的Troubleshooting部分

　　升级前后对比：

　　升级前：

Switch#dir flash:Directory of flash:/5 drwx 192 Mar 01 1993 00:03:52 c3750-i9-mz.121-19.EA1d15998976 bytes total (9545728 bytes free)Switch#Switch#sh verCisco Internetwork Operating System SoftwareIOS (tm) C3750 Software (C3750-I9-M), Version 12.1(19)EA1d, RELEASE SOFTWARE (fc1)Copyright (c) 1986-2004 by cisco Systems, Inc.Compiled Mon 05-Apr-04 22:40 by antoninoImage text-base: 0x00003000, data-base: 0x007CBC3CROM: Bootstrap program is C3750 boot loaderBOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.1(19r)EA1b, RELEASE SOFTWARE (fc2)Switch uptime is 16 minutesSystem returned to ROM by power-onSystem image file is "flash:c3750-i9-mz.121-19.EA1d/c3750-i9-mz.121-19.EA1d.bin"cisco WS-C3750G-12S (PowerPC405) processor (revision H0) with 118776K/12288K bytes of memory.Processor board ID CAT0849N2YULast reset from power-on1 Virtual Ethernet/IEEE 802.3 interface(s)12 Gigabit Ethernet/IEEE 802.3 interface(s)The password-recovery mechanism is enabled.512K bytes of flash-simulated non-volatile configuration memory.Base ethernet MAC Address : 00:129:97:7C:80Motherboard assembly number : 73-8307-08Power supply part number : 341-0048-01Motherboard serial number : CAT084911NJPower supply serial number : DTH08441JZ5Model revision number : H0Motherboard revision number : A0Model number : WS-C3750G-12S-SSystem serial number : CAT0849N2YUTop Assembly Part Number : 800-21966-01Top Assembly Revision Number : L0Version ID : N/AHardware Board Revision Number : 0x07Switch Ports Model SW Version SW Image------ ----- ----- ---------- ----------* 1 12 WS-C3750G-12S 12.1(19)EA1d C3750-I9-MConfiguration register is 0xFSwitch#

　　升级后：

Switch#sh flash:Directory of flash:/2 -rwx 1075 Mar 1 1993 00:24:27 00:00 config.text3 drwx 192 Mar 1 1993 00:23:48 00:00 c3750-i5-mz.122-25.SEA5 -rwx 5 Mar 1 1993 00:24:27 00:00 private-config.text15998976 bytes total (8053760 bytes free)Switch#Switch#sh verCisco IOS Software, C3750 Software (C3750-I5-M), Version 12.2(25)SEA, RELEASE SOFTWARE (fc)Copyright (c) 1986-2005 by Cisco Systems, Inc.Compiled Tue 25-Jan-05 20:26 by antoninoROM: Bootstrap program is C3750 boot loaderBOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.1(19r)EA1b, RELEASE SOFTWARE (fc2)Switch uptime is 2 minutesSystem returned to ROM by power-onSystem image file is "flash:c3750-i5-mz.122-25.SEA/c3750-i5-mz.122-25.SEA.bin"cisco WS-C3750G-12S (PowerPC405) processor (revision H0) with 118784K/12280K bytes of memory.Processor board ID CAT0849N2YULast reset from power-on1 Virtual Ethernet interface12 Gigabit Ethernet interfacesThe password-recovery mechanism is enabled.512K bytes of flash-simulated non-volatile configuration memory.Base ethernet MAC Address : 00:129:97:7C:80Motherboard assembly number : 73-8307-08Power supply part number : 341-0048-01Motherboard serial number : CAT084911NJPower supply serial number : DTH08441JZ5Model revision number : H0Motherboard revision number : A0Model number : WS-C3750G-12S-SSystem serial number : CAT0849N2YUTop Assembly Part Number : 800-21966-01Top Assembly Revision Number : L0Version ID : N/AHardware Board Revision Number : 0x07Switch Ports Model SW Version SW Image------ ----- ----- ---------- ----------* 1 12 WS-C3750G-12S 12.2(25)SEA C3750-I5-MConfiguration register is 0xFSwitch#